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Synthesis, characterization, and degradation of poly(ethylene‐ b ‐ ε ‐caprolactone) diblock copolymer
Author(s) -
Báez José E.,
RamírezHernández Aurelio,
MarcosFernández Ángel
Publication year - 2010
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1399
Subject(s) - copolymer , polymer chemistry , materials science , caprolactone , thermogravimetric analysis , hydrolysis , polymerization , ring opening polymerization , ethylene , catalysis , organic chemistry , chemistry , polymer , composite material
Poly(ethylene‐ b ‐ ε ‐caprolactone) (PE‐ b ‐PCL) diblock copolymers were synthesized by ring‐opening polymerization (ROP) of ε ‐caprolactone (CL) with α ‐hydroxyl‐ ω ‐methyl polyethylene (PE‐OH) as a macroinitiator and ammonium decamolybdate (NH 4 ) 8 [Mo 10 O 34 ] as a catalyst. Polymerization was conducted in bulk (130–150°C) with high yield (87–97%). Block copolymers with different compositions were obtained and characterized by 1 H and 13 C NMR, MALDI‐TOF, SAXS, and DSC. End‐group analysis by NMR and MALDI‐TOF indicates the formation of α ‐hydroxyl‐ ω ‐methyl PE‐ b ‐PCL. The PE‐ b ‐PCL degradation was studied using thermogravimetric analysis (TGA) and alkaline hydrolysis. The PCL block was hydrolyzed by NaOH (4M), without any effect on the PE segment. Copyright © 2009 John Wiley & Sons, Ltd.